Air Cleaner Arrangements; Components; and, Methods

ABSTRACT

An air cleaner assembly and components therefor are described. The components include features of an air cleaner housing; advantageous main filter cartridges; and, advantageous safety filter cartridge features. Features of the main filter cartridge are provided to engage an access cover of the assembly, and a cartridge support within the housing, in a preferred manner. Methods of assembly and use are also described.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuing application of U.S. Ser. No.14/977,930, filed Dec. 22, 2015. U.S. Ser. No. 14/977,930 is acontinuation of U.S. Ser. No. 14/040,966, filed Sep. 30, 2013, whichissued as U.S. Pat. No. 9,221,004. U.S. Ser. No. 14/040,966 is acontinuation of U.S. Ser. No. 13/274,474 filed Oct. 17, 2011, whichissued as U.S. Pat. No. 8,545,588 on Oct. 1, 2013. U.S. Ser. No.13/274,474 is a continuing application of U.S. Ser. No. 12/218,783,filed Jul. 17, 2008, which issued as U.S. Pat. No. 8,038,756. U.S. Ser.No. 12/218,783 includes the disclosure of U.S. Ser. No. 61/126,222,filed Apr. 30, 2008. The complete disclosures of U.S. Ser. No.14/977,930; U.S. Ser. No. 14/040,966; U.S. Ser. No. 13/274,474; U.S.Ser. No. 12/218,783 and U.S. Ser. No. 61/126,222 are incorporated hereinby reference.

Also, the present application includes features of U.S. Ser. No.60/961,521, filed Jul. 20, 2007. The complete disclosure of 60/961,521is incorporated herein by reference. A claim of priority to each of U.S.Ser. No. 14/977,930; U.S. Ser. No. 14/040,966; U.S. Ser. No. 13/274,474;U.S. Ser. No. 12/218,783; U.S. Ser. No. 60/961,521; and, 61/126,222, ismade to the extent appropriate.

FIELD OF THE DISCLOSURE

The present disclosure relates to air cleaners. It particularly concernsair cleaners including a main filter cartridge having an open with aradial seal. The features described include a main filter cartridge inpreferred engagement with an access cover of a housing and an internalfilter support, when installed. The features also relate to a mainelement seal also operating as a water seal; an improved safety filterassembly; and other features for convenient assembly and use. Also, somealternative arrangements are described.

BACKGROUND

Air cleaners are used to filter combustion intake air for internalcombustion engines of a variety of vehicles and other equipment, suchas: trucks; buses; off-road construction equipment; agricultureequipment; generator sets; etc. Such air cleaners typically include ahousing with a removable and replaceable main filter cartridgepositioned therein. The housing includes a service access cover, forselected access to an internally received filter cartridge, forservicing. The filter cartridge is typically serviced by being removedand either: by being replaced with a factory new cartridge; by beingrefurbished and being reinstalled; or, by being replaced with apreviously used, but refurbished, cartridge.

Issues relating to air cleaner arrangements with a serviceable filtercartridge include: ensuring proper installation and sealing; obtainingappropriate support for the filter cartridge within the air cleaner;ensuring that the air cleaner housing is protected against improperinstallation of filter cartridge; providing for convenient installationand removal; providing for convenient installation and configuration ofsafety cartridges; providing a convenient water seal within the housing,between selected housing parts; and, providing for convenient assembly.

Improvements in air cleaner assemblies and filter cartridges therefor,which are directed to these issues, are described herein.

SUMMARY

According to the present disclosure, air cleaner assemblies andcomponents and features thereof are described. Among the componentsdescribed are main filter cartridges and safety filter cartridges. Inaddition, specific features of air cleaner housings are characterized.

There is no specific requirement that an assembly include all of thefeatures characterized herein, to obtain some benefit according to thepresent disclosure.

In an examples described, the main filter cartridge includes an end capadjacent the access cover, configured for preferred engagement with theaccess cover and a filter cartridge support positioned within thehousing. In addition, a safety or secondary cartridge is configured forpreferred engagement between the main element and the cartridge support.The interactions among the access cover, main filter cartridge, safetycartridge and cartridge support, are configured to provide advantageoussupport to the various cartridges and/or to ensure that an appropriatemain cartridge is appropriately positioned in the housing, before theair cleaner is used.

A variety of advantageous housing features are described for the aircleaner assembly. Also methods and techniques for assembly and use aredescribed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic side elevational view of an air cleaner assemblyaccording to the present disclosure with portions broken away to depictinternal features in cross section.

FIG. 2 is a schematic, outlet end, elevational view of the air cleanerassembly of FIG. 1.

FIG. 3 is a schematic, exploded, perspective view of the air cleanerassembly of FIGS. 1 and 2.

FIG. 4 is a schematic top plan view of the air cleaner assembly of FIG.1.

FIG. 5 is a schematic cross sectional view showing the air cleaner ofFIG. 1; it being noted that in FIG. 5 the air cleaner is rotatedrelative to FIG. 1.

FIG. 6 is a schematic, exploded, side elevational view depictingselected componentry of the air cleaner assembly of FIG. 1.

FIG. 7 is a fragmentary, schematic, exploded cross-sectional viewdepicting componentry of FIG. 6.

FIG. 7A is a schematic, enlarged fragmentary cross-sectional view of aportion of FIG. 7.

FIG. 7B is a schematic, enlarged, fragmentary, cross-sectional view of aaccess cover portion of FIG. 7.

FIG. 8 is a enlarged schematic closed-end elevational view of a mainfilter cartridge component of the assembly of FIGS. 1-3.

FIG. 9 is a schematic side elevational view of the main filter cartridgeof FIG. 8, with portions shown in cross section.

FIG. 9A is a schematic closed end elevational view of the cartridge ofFIG. 9.

FIG. 9B is a schematic open end elevational view of the cartridge ofFIG. 9.

FIG. 9C is a schematic, enlarged, fragmentary view of a designatedportion of FIG. 9.

FIG. 9D is a schematic, enlarged, fragmentary view of a portion of FIG.9A.

FIG. 9E is a schematic, enlarged, fragmentary view of a portion of FIG.9B.

FIG. 9F is a schematic, cross-sectional view of an open end cap portionof the filter cartridge of FIG. 9.

FIG. 9G is a schematic, enlarged, fragmentary view of a portion of FIG.9F.

FIG. 10 is a schematic enlarged, fragmentary cross sectional view of aselected portion of FIG. 5.

FIG. 11 is an enlarged, schematic, fragmentary view of a selected,designated, portion of FIG. 5.

FIG. 12 is a schematic, outside end, elevational view of an access covercomponent of the assembly of FIG. 1.

FIG. 13 is a schematic, side elevational view of the component of FIG.12.

FIG. 14 is a schematic, enlarged, perspective view of an end covercomponent of the air cleaner assembly of FIG. 1.

FIG. 14A is a schematic, cross-sectional view of the end cover componentof FIG. 14.

FIG. 15 is a schematic, enlarged, cross-sectional view of a housing mainbody component of the assembly of FIG. 1.

FIG. 16 is a schematic, enlarged, fragmentary view of designated portionof FIG. 15.

FIG. 17 is a schematic, enlarged, fragmentary view of a designatedportion of FIG. 15.

FIG. 18 is an enlarged, schematic, side perspective view of a centersupport component of the air cleaner assembly of FIG. 1.

FIG. 19 is a schematic, side elevational view of the center supportcomponent of FIG. 18.

FIG. 20 is a schematic, cross-sectional view of the center support ofFIG. 19.

FIG. 21 is a schematic, enlarged, fragmentary view of a selected anddesignated portion of FIG. 20.

FIG. 22 is a schematic, closed-end elevational view of the support ofFIG. 20.

FIG. 22A is an open end elevational view of the component depicted inFIG. 19.

FIG. 23 is a schematic, enlarged, fragmentary view of a selected andidentified portion of FIG. 20.

FIG. 24 is an enlarged, schematic, side elevational view of a safetycartridge component of the assembly of FIG. 1.

FIG. 25 is an enlarged, end elevational view of the safety cartridge ofFIG. 24; taken toward an end having an end cap thereon.

FIG. 26 is a schematic, end elevational view of the safety cartridgecomponent of FIG. 24; taken toward an end having no end cap.

FIG. 27 is an enlarged, schematic, exploded side elevational viewshowing interaction among selected components of the assembly of FIG. 1.

FIG. 28 is a schematic, cross-sectional view taken generally along line29-29, FIG. 28.

FIG. 29 is a schematic, fragmentary, enlarged cross-sectional view of afirst alternate main filter cartridge component shown installed in thehousing, with a safety cartridge generally otherwise according theassembly of FIG. 1.

FIG. 30 is an enlarged, schematic, fragmentary, perspectivecross-sectional view taken of the first alternate main filter cartridgeof FIG. 29, installed in the air cleaner assembly including a housingthe safety cartridge otherwise in general accord the assembly of FIG. 1.

FIG. 31 is a schematic, fragmentary, cross-sectional view of a secondalternate main filter cartridge, installed in the air cleaner assemblyincluding a housing and safety cartridge otherwise in general accord theassembly of FIG. 1.

DETAILED DESCRIPTION I. First Example Embodiment, FIGS. 1-28 A. SelectedGeneral Air Cleaner Features.

The reference numeral 1, FIG. 1, generally indicates an air cleaner orair cleaner assembly according to the present disclosure. The aircleaner assembly 1 includes a housing 2 defining an interior 2 i inwhich is positioned, in the example depicted, a main filter cartridge 5,a secondary or safety cartridge 6 and a cartridge support 7. (Thecartridge support 7 can be considered as part of the housing 2, since,in normal use, support 7, is not seperable from housing 2).

Housing 2 includes cartridge receiving body section 10 having a firstend 11 and a second, opposite, end 12. First end 11 defines a serviceopening, through which cartridge 5 (and safety cartridge 6, if desired)can pass during servicing. First end 11 is generally closed by accesscover 15, removably secured in placed by latches 16. Service access tointerior 2 i, then, is obtained by unlatching latches 16, and removingaccess cover 15 from end 11.

Second end 12, of body section 10, is enclosed by outlet end cover 20having air flow outlet tube 21 therethrough, with conduit open end 22.

The housing 2 further includes an air flow inlet 25. The particularinlet 25 depicted is a tangential inlet, meaning that air flow intoinlet 25 is generally not directed toward central axis 26 of housing 2,but rather is in a direction generally tangential to a circular shape ofhousing central cartridge receiving section 10. Alternate types ofinlets 25 can be used with arrangements according to the presentdisclosure, however.

Housing 2 further includes a dust ejector outlet tube or drop tube 30.The drop tube 30 provides for evacuation of a certain collected dustand/or water, within interior 2 i during operation. In a typicalapplication, the drop tube 30 has mounted thereon a evacuator valvearrangement, depicted schematically in phantom lines, at 31. Suchevacuation valves are wall known.

Still referring to FIG. 1, the cleaner housing 2 includes an optionalmounting pad arrangement 35 thereon; the mounting pad arrangement 35being configured so that the housing 2 can be mounted on an assembly foruse, such as a vehicle or construction equipment. It is noted that avariety of mounting arrangements for vehicles and other equipment can beused, including mounting pads and/or mounting bands. The mounting padarrangement 35 depicted, typically includes threaded bosses 35 x, FIG.2, embedded therein, so that housing 2 can be mounted by bolts insertedthrough a portion of a frame of equipment on which the air cleaner 1 ismounted, and into mounting pad 35.

Referring to FIG. 1, it is noted that for the assembly 1 depicted: theinlet tube 25 is positioned in, and is part of, the central cartridgereceiving section 10; outlet tube 21 is positioned in, and is part of,the outlet end cover 20; and, the dust drop tube is positioned in, andas part of, the access cover 15. Alternate configurations and locationsof these tube components are possible. However, the particulararrangement is advantageous, for use with features according to presentdisclosure. It is further noted that the inlet tube 25 is locatedadjacent end 12, an opposite end of housing 2 from the location of droptube 30. This will be typical of assemblies according to presentdisclosure, although alternatives are possible.

In normal operation, air will enter air cleaner assembly 1 through inlet25. A tangential definition of inlet 25, along with an interior aircyclone ramp 38, causes the air, within interior 2 i to initially bedirected in a coiled or cyclonic fashion. This will tend to separatelarger particles of dust and water out of the airflow. The largerparticles of water and dust will migrate to tube 30, and be ejectedthrough the dust drop tube 30. Air still carrying some particulatematerial therein, will be directed through main cartridge 5; throughsafety cartridge 6, and to interior 7 i of support 7. From here, the nowfiltered air is generally directed to outlet end 40, of housing 2, andinto air flow outlet tube 21, where it can be directed into duct workand then to appropriate engine componentry; typically eventually to bedirected into an engine air intake of an internal combustion engine.

Still referring to FIG. 1, at 41 is located at tap usable in associationwith the restriction indicator equipment. An adapter for mounting massair flow sensor can also be included in tube 21, if desired.

It is noted that the particular outlet tube 21 depicted, has bend 21 xtherein, providing a 90° turn in tube 21. Alternatives are possible.

Still referring to FIG. 1, example dimensions are provided, tofacilitate an understanding of an example application of techniquesaccording to the present disclosure. It is noted that the techniques canbe applied in wide variety of size and shaped units. The exampledimensions provided in this disclosure, then, merely indicate an exampleuseable assembly. Referring to FIG. 1, the identified dimensions are asfollows: AA=323.6 mm; AB—32 mm; AC=172.1 mm; AD=186.5 mm; AE=43.3 mm;AF=183.8 mm; AG=323.4 mm; and AH=426.5 mm.

Attention is now directed to FIG. 2, an end elevational view generallytaken toward end 20. Here, a circular cross-sectional shaped housingsection 10 is viewable, along with a tangential inlet nature of inlet25. In particular, central axis 25 x of inlet 25 is directed generallytangentially, with respect to the circular shape of housing body 2(i.e., housing section 10).

Referring to FIG. 2, it can be seen that particular assembly 1 depicted,includes three (3) latches 16 in access cover 15. An alternate number oflatches is possible, but three evenly, radially, spaced latches 16 isconvenient.

Referring to FIG. 2, example dimensions are indicated as follows:BA=63.5 mm; BB=51.8 mm; BC=233.4 mm; BD=121.4 mm; BE=97.6 mm; BF=54 mm;BG=63.5 mm; BH=45 mm; and BI=90 mm.

Attention is now directed to FIG. 3, an exploded perspective view ofassembly 1. In FIG. 3, the exploded depiction shows separate componentsusable to form assembly 1. It is noted that with respect to access cover15, latches 16 would generally be pre-formed and then be positioned inplace on cover 15.

In FIG. 4, a top plan view of the assembly 1, when as oriented in FIG.1, is depicted. At 45 an interlock arrangement is depicted, forengagement with a mounting band arrangement, if used. At 46,strengthening ribs are provided, in sidewall 10 s of central cartridgereceiving section 10.

In FIG. 5, side cross-sectional view through air cleaner assembly 1 istaken. It is noted that in FIG. 5, the orientation is reversed from FIG.1, with the outlet tube 21 on the right and the dust drop tube 30 on theleft.

In FIG. 5, attention is directed to end ramp 38. End ramp 38 is coiledin a helical pattern. As air is directed through inlet 25, FIG. 1, itwill be initially directed by ramp 38 in a generally helical patterndirection indicated by arrows 52, FIG. 5. Still referring to FIG. 5, itcan be seen that, for the example assembly 1 depicted, the outlet endcover 20 is separately formed piece, attached (in the example snap-fit)to housing central section 10, to form end wall 40. This feature isdiscussed in the next section.

B. Selected Features Relating to the Outlet End Cover 20.

Attention is now directed to FIG. 15, a side cross-sectional view ofhousing central cartridge receiving section 10. End 12, which in theassembly 1 is an outlet end of the housing 2, opposite access cover 15,FIG. 1, is shown defining an end peripheral ring 60, supporting acentral internally directed flange 61; flange 61 generally projectingtoward end 11 (and access cover 15) from end 12. (Referring to FIG. 5,it is noted that ring 60 and flange 61 are not continuously symmetricaround axis 26. Rather, ring 60 varies in size, supporting flange 61 toform the ramp 38).

Referring to FIG. 15, flange 61 includes a base region 62 with aninwardly directed ring 63, surrounding and defining aperture 65. Ring 63is configured define a rotation indexing arrangement 66 comprising aplurality of adjacent teeth 67. The teeth 67 define a jagged, (radiallyinwardly directed) surface 67 s, which can be used to rotationally indexcover 20, in assembly 1, FIG. 1. This is discussed further below.

In FIG. 17, an enlarged fragmentary cross-sectional view of a selectedportion of flange 61 is depicted, for clarity. Referring to FIG. 17,axially, outwardly from toothed surface 67 s is provided an axial endrim or boss 68. Axially inwardly from surface 67 s is provided a secondboss 69. It is noted that boss 68 engages recess 67 x, in which surface67 s in positioned at a sharp angle, whereas boss 69 engages region 67 sat a diagonal.

Referring to FIG. 17, flange 61 includes extension 61 x and tip 61 t.Along an inner surface 61 i, flange 61 includes an inner projectiontransition 61 p, between regions 61 x and ribs 61 t. Thus, adjacent tip61 t is provided recess regions 61 r, in an outer surface of extension61 x.

In FIGS. 15 and 17, example dimensions indicated as follows: FA=103.5mm; FB=10.5 mm; FC=53.1 mm; FD=89 mm; FE=6 mm; FF=168.1 mm; FG=24.5 mm;FH=140.7 mm; FI=170.2 mm; FJ=175.2 mm; FK=186.5 mm; FL=135.8 mm;FM=133.8 mm; and FN=2 mm. In FIG. 17, IA=24.5 mm; IB=7.2 mm; IC=2.5 mm;ID=1.2 mm radius; IE=30°; IF=16.2 mm; IG=9.2 mm; IH=1.5 mm radius; andII=2 mm radius.

Attention is directed to FIG. 14, in which end piece or cover 20 isdepicted, with outlet tube 21 thereon. Referring to FIG. 14, for theparticular example assembly 1 depicted, the end cover 20 is formedintegral with the outlet tube 21. The end cover 20 includes an endsurface 70 having outer peripheral rim 71. The outlet tube 20 includesan interior tube section 75 which provides an airflow tube 76 extendingthrough end 70. Tube section 75 is defined by projection 79 havinginterior surface 78.

Still referring to FIG. 14, end cover 20 includes a peripheral ring 80projecting away from end cover 70, around projection 79, and intointerior 2 i of housing 2, when installed. Thus, ring 80 generallyextends inwardly of central cartridge receiving section 10, when endcover 20 is in positioned housing 2. Ring 80 includes an outer basesection 81, with rotational indexing arrangement 82, comprisingplurality of radially outwardly directed teeth 83. The rotationalindexing arrangement 82 is configured to engage rotational indexingarrangement 66, FIG. 15, and to retain outer tube 20 in a selectedrotational orientation, relative to central cartridge receiving section10. This engagement occurs by an interaction between teeth 83 and teeth67, that inhibits undesired rotation of central cartridge receivingsection 10 relative to cover 20. It is noted that typically the amount,and shape of interference between teeth 83 and teeth 67, is selected sothat it a person exerting appropriate pressure on tube 21, can rotatepiece 20 relative to the housing central cartridge receiving section 11.Thus, the tube 21 can be rotated for selected mounting engagement withtube 21 selected and in a desired direction. However, the amount ofinterference, and shape of interference, between teeth 83 and teeth 67is typically selected so that outlet end 20 will retain a selectedrotational orientation with respect to housing section 10, once mounted,with respect to an ordinary vibration effects and similar effectsexpected to encountered, during air cleaner operation.

Referring now to FIGS. 1-3, generally outer tube 21, which has beenelbow 21 therein, should be oriented to direct end 21 e in whateverdirection is desired, for engagement with duct work, when air cleanerassembly 1 is mounted on the equipment. An equipment manufacturer mayprovide specific direction to the air cleaner manufacturing company, forparticular location of direction for outer tube 12. With the assemblycharacterized, cover 20 can be mounted in the appropriate radialorientation, relative to the housing central section 10, to accommodatethis, during assembly. The outer tube 21 will be retained in theselected rotational orientation, due to the rotational indexing andinterlock provided by rotational indexing arrangement 66 engaged inrotational indexing arrangement 82. On the other hand, a modificationcan be made by grabbing tube 21 and rotating it sufficiently to overcomethe interference between the teeth 83, 67, as previously described, toobtain an orientation of tube 21 at a desired direction.

End cover 20 is positioned on the housing central cartridge receivingsection 10, in the selected rotational orientation. The end cover 20 issecured to the housing central cartridge receiving section 10 by a snapfit, involving radially inward projection 68 on end 12, FIG. 17,projecting into radial recess 72, FIG. 14A on end cover 20, betweenflange 71 and tooth arrangement 81. It is noted that there wouldtypically not be a seal provided at a joint 74, FIG. 11, between endcover 20 and housing section 10 in housing 2. A water (weather) sealpreventing leakage through joint 74 will, however, be desirable. One isprovided in advantageous manner by an internally received main filtercartridge 5, once installed as discussed below.

C. Access Cover 15.

Referring again to FIG. 1, it is noted that generally the dust drop tube30 should be directed downwardly, when the air cleaner assembly 1 ismounted in a vehicle or other equipment for use. Since the drop tube 30is mounted on the access cover 15, this means that the access cover 15should be positionable in a variety of rotational orientations, relativeto housing section 10, for the air cleaner assembly 1 to be widelyuseable by mounting in a variety of orientations. Access cover 15, and,in general housing 2, includes features that account for alternaterotation alignment between cover 15 and housing center section 10.

With respect to this, attention is again directed to FIG. 15, across-sectional view of central cartridge receiving section 10. Here end11 is viewable, with radial outwardly directed flange 89. The flange 89includes a flange surface 90, which generally faces opposite end 12 ofhousing section 10. The example flange surface 90 is continuous, inextension around body 10. Flange 89 is configured so that flange surface90 can be engaged by latches 16, when access cover 15 is mounted inplace. It is preferred to provide an indexing arrangement between accesscover 15 and housing section 10, so that access cover 15 will not rotatewhen mounted on housing 10. Further, this indexing arrangement can beused to ensure that drop tube 30 is directed downwardly, no matter whatthe rotational orientation of central cartridge receiving section 10.

With respect to rotational indexing of access cover 15, attention isdirected again to FIG. 15, and in particular to interior region 92, offlange 89. Region 92 includes a rotational indexing arrangement 95, inthe form of a ratchet arrangement 95 r comprising spaced teeth 96, eachtooth 96 being directed axially away from end 12. As will be understood,the rotational indexing arrangement 95 is configured to providerotational indexing to access cover 15, when access cover 15 is mounted,inhibiting rotation of access cover 15 independently of central coverreceiving section 10. This will be understood by reference to FIGS. 12and 13.

Referring first to FIG. 12, access cover 15 is viewable, the a viewbeing taken generally toward outside surface 15 x of access cover 15.Latches 16 can be seen mounted on bosses 100. Typically, the bosses 100are positioned so that the latches 16 cannot reach past an outerperiphery of flange 89, to engage flange surface 90, FIG. 15, unless theaccess cover 15 is fully and properly installed on housing centralsection 10. This is typically not possible, when cartridge 5 is housing2, unless the cartridge 5 is properly installed.

Attention is now directed to FIG. 13, a side elevational view of accesscover 15. Here, access cover 15 can be seen to have a projecting flange104 surrounded by a ring 104. Flange 104 is sized to be inserted withinend 11 center section 10, when access cover 15 is mounted. As shown inFIG. 5, flange 105 is generally sized to either have asurface-to-surface fit with rim 106 of section 10, for it be only spacedtherefrom a small amount. Flange 104 may be configured to bottom outagainst shelf 106 s in housing 10, as outer flange 107 is sized tobottom out against tip 11 t.

Surrounding flange 104, FIG. 13, is provided a rotational indexingarrangement 108, comprising spaced teeth 109; the teeth 109 beingdirected toward end 20 of housing 2 when access cover 15 is installed;and, the teeth 109 being sized for interlock with, and in rotationalinterference with, selected ones of teeth 96. Thus, when access cover 15is positioned in place an housing section 10, and latches 16 are securedby engagement of with flange 89, FIG. 15, the access cover 15 will beretained securely in place and will not rotate. Thus, drop tube 30 ispositioned and maintained in a selected downward rotation.

Referring to FIGS. 12 and 13, some example dimensions are provided asfollows: DA=186.5 mm; DB=120°; DC=121.4 mm; DD=60°; EA=58.8 mm; EB=58.7mm; EC=54 mm.

In FIG. 14A a cross-sectional view of end piece or cover 20 is depicted.Example dimensions provided in FIG. 14A are as follows: OA=143.6 mm;OB=135.6 mm; OC=78.6 mm; OD=76.8 mm; OE=74.8 mm; OF=4.6 mm; OG=5.2°;OH=20.7 mm; OI=27.8 mm; OJ=57 mm; OK=63.5 mm; and, OL=65.5 mm.

Typically, end surface 40, FIG. 14A, is configured to project radiallyinwardly from outer flange 71 toward base 21 b of tube 21, a distanceindicated generally at D1, of at least 10 mm, typically at least 12 mm,usually at least 18 mm, and typically an amount within the range of18-32 mm.

In FIG. 16, an enlarged, fragmentary view of a portion of FIG. 15 isproved. Referring to FIG. 16, dimensions indicated are as follows:HA=34.1 mm; HB=5.5 mm; HC=3.5 mm; HD=10.5 mm; HE=1.1 mm; HF=2.5 mm;HG=5.7 mm; and, HI=8.1 mm.

D. Central Support 7

Referring again to FIG. 5, assembly 1 includes, mounted within housinginterior 2 i, a central tower or cartridge support 7. The cartridgesupport 7 includes a first, open, end 120 and a second, opposite, end121, in the example depicted closed by end cover 122. Sidewall 125extends between ends 120, 121. The sidewall 125 is perforate, i.e.includes a plurality of apertures 126 therethrough. As will beunderstood from detailed discussion features described below, althoughalternatives are possible, cartridge support 7 is not molded integral toa remaining portion of housing 2. Rather support 7 is a pre-formedpiece, snap-fit into housing 2, when housing 2 is assembled. Inparticular cartridge support 7 is snap-fit in place by attachment to aportion of end cover 20.

Attention is now directed to FIG. 18, in which cartridge support 7 isdepicted in a perspective view. The perspective view is generally a sideview, also taken partially toward end cover 122. End cover 122 for theexample depicted is closed, i.e. it includes no apertures therethrough.End cover 122 includes features therein, for engagement with the filtercartridge 5, described in greater detail below. Referring to FIG. 18, itis noted that the example cartridge support 7 depicted, is configuredwith sidewall 125 having a generally conical shape, tapering downwardlyin cross-sectional size, from end 125 x, adjacent end 120, to end 125 y,adjacent end 121. A variety of specific shapes of cartridge support 7are possible, the example configuration depicted being preferred.

Referring to FIG. 18, at 128, a connector arrangement is depicted, forsecurely mounting cartridge support 7 within housing 2. The particularconnector arrangement 128 depicted, includes a recess or trough 129positioned between a first ring 130 and a second 131.

Referring to FIG. 19, a side elevational view of cartridge support 7 isdepicted. Recess or trough 129 is again viewable, between rings 130,131. In FIG. 19, the example dimensions are provided as follows:JA=281.5 mm; JB=19.1 mm; JC=9.1 mm; JD=8′; JE=52.9 mm; JF=68.8 mm;JG=71.2 mm; JH=73.5 mm; JI=5 mm; and, JJ=15 mm.

It is noted that the sidewall 125 generally includes a conical angle oftaper, indicated at X, downwardly from end 125 x to end 125 y of atleast 1°, typically not more than 5°.

Attention is now directed to FIG. 20, a cross-sectional view ofcartridge support 7. The example dimensions provided in FIG. 20 are asfollows: KA=52.9 mm; KB=44.6 mm; KC=13 mm; KD=6 mm; KE=10.2 mm; KF=2°;KG=19.4 mm; KH=21.5 mm; and, KI=65.93 mm.

In FIG. 20, a cross-sectional view of support 7, the examplecross-sectional profile of ring 130, trough 129 and ring 131 areprovided to facilitate an understanding of the mounting cartridgesupport 7 within the housing 2. A portion of cartridge 7, incross-section, depicting a cross-sectional profile of these features isshown in an enlarged view, in FIG. 23.

Referring to FIG. 23, ring 131 can be seen to from a large, abrupt, endstop to trough region 129 along a side of trough 129 opposite open end120. Ring 130, on the other hand, which is on an opposite side of trough129 from ring 131, is a lower ring in projection away from trough 129,and generally provides a slanted, ramped, surface 134 extending fromopen end 120 to trough 129. In general, as cartridge support 7 isinstalled, an engagement arrangement extends over ring 130 and intotrough 129, to secure cartridge 7 in position by a snap fit connection.

Referring to FIG. 23, example dimensions indicated herein are asfollows: MA=2.4 mm; MB=6 mm; and, MC=11°.

Attention is now redirected to FIG. 14, a perspective view of end cover20. As previously described, end cover 20 includes a centrallypositioned ring 76 therein, configured to be directed axially intohousing interior 2 i from end cover 20, when the end cover is installedin housing central cartridge receiving section 10. Ring 76 includes aninner surface 78. Adjacent inner rim 136, of ring 76, along innersurface 78 is provided tab arrangement 137 comprising an engagementarrangement, in the example depicted comprising spaced tabs 138. For theparticular tab arrangement 137 depicted, there will be three spaced tabs138, radially evenly spaced, only two being viewable in FIG. 14.

A cross-sectional view of tabs 138 is generally depicted in FIG. 14A.Referring to FIG. 14A, a tab 138 is viewable having a slanted outersurface 138 s slanting inwardly from rim 136 to end 140, at which pointedge 141 is provided.

Attention is now directed to FIG. 5, as support 7 is pushed into ring76, end 120 will be positioned in ring interior 78. Ring 130, FIG. 11,will pass across tabs 138, with tabs 138 then becoming locked withinrecess 129 between rings 130, 131. This is shown in an enlarge schematicview, in FIG. 11.

For a typical air cleaner assembly 1, the cartridge support 7 is notremoved or disconnected from the housing 2, once installed. That is, thecartridge support 7 is permanently secured to ring 76 of end cover 120once installed. Also, there is typically no seal provided betweensupport 7 and ring 76.

E. Safety Cartridge 6

Referring to FIG. 5, assembly 1 includes an optional secondary or safetycartridge 6 which, in installation, is positioned over cartridge support7, and is received with an interior of main filter cartridge 5, wheninstalled. The safety cartridge 6 is depicted in FIGS. 24-26.

Referring first to FIG. 24, the safety cartridge 6 comprises sidewall150 extending between a first end 151 and second end 152. The first end151 is typically an open end 154, in the example shown having no end capthereat. End 152 is typically provided with end cap 155 thereon,typically molded-in-place. The end cap 155, as will be see from furtherdescriptions below, is typically provided as an open ring 156. Open ring156 is provided with an appropriate gasket characteristic, to form aseal in use. Examples of a manner in which this can be provided include:molding the end cap 155 from a soft, compressible, seal formingmaterial, such as a foamed polyurethane described below; forming aportion of end cap 155 from a rigid material, and then applying soft,compressible, gasket like material thereto, for example by a co-moldingprocess or using an adhesive; or, forming end cap 155 from a materialdefining a flex seal, such as a Santoprene material. In the exampledepicted, the former is used, i.e. end cap 155 is molded from a materialcapable of forming a seal, such as foamed polyurethane. Foamedpolyurethane usable for this described is generally herein below.

The sidewall 150 is porous (i.e. permeable to gas flow therethrough).The sidewall 150 can be formed as a mesh or grid such as mesh 159, FIG.24. A polypropylene mesh, for example, can be used.

For the particular example assembly depicted, the cartridge 6 isintended to operate as a safety cartridge, and thus air filter media,typically not pleated, is provided adjacent the sidewall 150. For theparticular depicted, a conical media segment is positioned on aninterior of wall 150, against wall 150. A variety of arrangements can beused to secure the media in place. It is anticipated that a media conemay be sealed at a seam by sonic welding, while at the same time beingtacked to sidewall 150, when the media comprises a synthetic-containingfiber material.

It is noted that in some applications, cartridge 6 can be providedwithout media thereon, when a secondary filter is not desired.

Referring to FIG. 24, the particular sidewall 150 depicted generally hasa conical shape, tapering downwardly in extension from end 151 to end152. The conical shape to sidewall 150 will generally be made to matchthe conical to shape to sidewall 125 of support 7.

Attention is now directed to FIG. 25, an end elevational view ofcartridge 6 taken generally toward end piece or end cap 155. Hereaperture 160, defined through open end cap 156, is viewable. Aperture160 will generally communicate with an interior of cartridge 6, insideof support 150.

In FIG. 26, an end elevational view or cartridge 6 taken generallytoward end 151 is viewable, schematically. Here, media cone 161 isviewable.

Attention is now directed to FIG. 5. It can be seen that when accesscover 15 is removed from the remainder of housing 2, and cartridge 5 isnot installed, end 154 of safety cartridge 6 can be pushed over sidewall125 of support 7, until: the sidewall 150 rests against sidewall 125.end 154 engages ring 162 on end piece 20, of FIG. 11; and, end cap 155engages shoulder 121 s at end 121 of support 7.

Referring to FIG. 11, a portion of media 161 in safety cartridge 6 isviewable, surrounded by mesh 159. End 154 of mesh 159 is seen pushedover ring 76 toward stop 162, with mesh 159 generally being securedaround surface 165, surface 165 being provided with a tapered downwardshape from stop 162 toward tip 136.

Engagement between end 154 of cartridge 6 and projection 79, alongsurface 165 can be sufficient and adequate for safety filter operation,in some instances. Thus, safety filter or safety cartridge configurationdescribed for cartridge 6, avoids a manufacturing step of providing anend cap to end 154. That is, end 154 includes no end cap thereon, in theexample depicted. Of course in some applications and the techniquesdescribed herein, an end cap can be provided at end 154.

F. The Main Filter Cartridge 5

Attention is again directed to FIG. 5. In FIG. 5, main filter cartridge5 is depicted installed within air cleaner housing 2, surroundingsupport 7 and safety cartridge 6. With respect to general features ofthe main filter cartridge 5, attention is first directed to FIG. 8.

Referring to FIG. 8, the main filter cartridge 5 includes a media pack170, comprising media, 170 p, extending between a first end 171 and asecond end 172. For the cartridge 5 depicted, the media 170 p issurrounded by outer support framework 175 having apertures 176 therein.

At end 171, (first) end cap 180 is provided. At end 172, (second) endcap 181 is provided.

The particular view of FIG. 8, is a perspective view taken toward a sideand also end 172. From the view of FIG. 8, it can be seen that theparticular example end cap 181 depicted, on end 172, is a closed endcap, having no aperture therethrough; although alternatives arepossible. The example end cap 181 depicted includes various features,described below, for preferred engagement with a portions of the housing2, when the cartridge 5 is installed.

Attention is now directed to FIG. 9, a side elevational view ofcartridge 5, with portions shown in cross-sectional view to facilitatean understanding of detail. Here, media 170 p can be viewed as extendingbetween ends 171, 172. The particular media 170 p depicted, comprises apleated media, although alternatives can be used.

Referring to FIG. 9, media 170 can be seen surrounding and defining anopen filter interior 185. The interior 185 is sized and shaped to bepositioned over safety cartridge 6 and cartridge support 7, whencartridge 5 is installed in the housing 2.

Attention is now directed to end cap 180 in FIG. 9. End cap 180 isgenerally an open cap, having a central open aperture 190 therethrough,in communication with cartridge interior 185. End cap 180 is typicallymolded-in-place and typically includes thereon (or therein) a materialcapable of forming a seal to a portion of the housing 2, when installed.Typically end cap 180 will be molded from a material such as a foamedpolyurethane as described herein below.

Still referring to FIG. 9, the example cartridge 5 depicted, can beviewed as having a conical shape, tapering downwardly in cross-sectionalsize from end 171 to end 172. The angle of taper, indicated at generallyat Y, will typically be less than the angle of taper X for the support7, and safety cartridge 6. Typically the angle of taper Y will be lessthan 1.5°, and usually at least 0.5°.

Also still referring to FIG. 9, cartridge 5 can be seen as including apre-form 195 having perforate sidewall section 175 and end section 196including: a (closed) central region 197; and, a perforate end region198 in overlap with an end 172 of media pack 170. During assembly, media170 p can be positioned in pre-formed support 195 and be positionedagainst perforate end 198, surrounding a portion of end section 196. Thepre-formed support 195 then can support the media pack 170 in a conicalform. End cap 181 can then be molded or potted in place, for example bybeing formed of a molded-in-place end cap material such as foamedpolyurethane as described herein below. When end 172 is secured, thecombination of the outer support 195 and media 170 p can then bepositioned with end 171 in a mold, to mold-in-place in cap 180.

Still referring to FIG. 9, cartridge 5 includes an outer peripheral sealregion 200 configured to define an outwardly directed housing radialseal surface 201. The particular outwardly directed radial seal surface201 depicted includes: tip region 202 defined by taper or steps 203;(non-stepped or flat) intermediate region 205; and, end shoulderprojection region 206. Generally region 206 comprises a larger diameterregion of end cap 180, than any other region.

Referring to FIG. 9, the example dimensions are indicated as follows:CA=135.2 mm; CB=82.7 mm; CC=1 mm; CD=23.5 mm; CE=312 mm; CF=13 mm; CG=3mm; CH=106.4 mm; and, CI=57 mm.

In FIG. 9A, an end elevational view of cartridge 5, taken toward end cap181 is viewable. In FIG. 9A, cross-section indication is provided, forthe portion in cross-section depicted in FIG. 9.

In FIG. 9B, an end elevational view of cartridge 5 taken toward end cap180 is provided.

In FIG. 9C, an enlarged fragmentary view of a portion of cartridge 5,indicated generally in FIG. 9, is provided. Here, a portion sealarrangement 200 on end cap 180 are viewable. Referring to FIG. 9C, sealarrangement 200 is a outer peripheral seal arrangement, surrounding aportion of end cap 180, and also end 171 of media pack 170. In generalterms, seal arrangement 200 is a peripherally directed radial sealarrangement, end cap 180.

Still referring to FIG. 9C, the particular end cap 180 depicted, ismolded-in-place end cap, with seal arrangement 200 molded integrallytherewith.

In FIG. 9C, attention is directed to groove 207 and end cap 180. Thegroove 207 is positioned in overlap with a portion of media pack 170, inthe example shown in overlap with outer support structure 175, theoverlap being axial. The groove 207 would typically extend continuouslyaround aperture 190, spaced from both aperture 190 and seal member 200.Groove 207 can comprise, for example, an artifact from a molding processin seal region 200, the seal region 200 is made. Further, groove 207 cancomprise a receiving groove for a projection arrangement on the housing2, as discussed below.

Still referring to FIG. 9C, surrounding aperture 190, and positionedradially inwardly from groove 207, end cap 180 includes, on end surface208, inner ring 209. The inner ring 209 will define an outer axialsurface 209 x, to be positioned against end wall 20, when cartridge 5 isinstalled in a housing 2.

In FIG. 9D, an enlarged, fragmentary portion of FIG. 9A is viewable.

In FIG. 9E, an enlarged fragmentary view of a portion of FIG. 9B isviewable.

In FIG. 9F, a schematic, cross-sectional depiction, fragmentary, isprovided of an end cartridge 5 including end cap 180 thereon. Again, endcap 180 with an outer peripheral seal member 200 thereon is depicted.

In FIG. 9G, an identified portion of FIG. 9F is shown in an enlargedview. Here, seal arrangement 200 is depicted. Regions 203, 205 and 206can be viewed. Referring to FIG. 9G, dimensions are as follows: QA=1.8°;QB=14.2 mm; QC=12.4 mm; QD=0.8 mm; QE=1.0 mm radius; QF=1 mm; QG=1.4 mmradius; QH=0.5 mm radius; QI=30°; QJ=3 mm radius; QK=16°; QL=1.5 mm;QM=1 mm; QO=1 mm; QP=2.6 mm; QQ=4.1 mm; QR=5.6 mm; QS=15.6 mm; QT=19.6mm; and, QU=24.5 mm.

In general terms, a shoulder or projection 206 is typically at least 0.5mm projection, away from adjacent portions of region 205, typically0.5-1.5 mm in projection; and, it includes a total length of the mostoutwardly projecting portion 206 p, of at least 1.5 mm, usually at least2 mm, and typically 2.5-5 mm length. Also typically region 206 p is flatover its length of extent. Region 206 p is sized to receive, abuttingthereagainst, a bead in the housing, discussed below.

In FIG. 9F, indicated dimensions are as follows: PA=135.2 mm; and,PB=133.2 mm.

Referring to FIG. 9G, surface 205 generally comprises an intermediatesurface between tip region 203 and rib 206. Surface 205 typically isflat and uninterrupted between regions 203 and 206, over a length of atleast 5 mm; usually at least 7 mm; and, typically 7-12 mm. Within theregion of central portion 205, of seal arrangement 200, typically region205 does not include any projections, beads, bumps, or grooves therein,but rather is a flat, featureless surface. Surface 205 may have a verysmall draft angle, in extension from region 203 to projection 206,however any such angle will typically be relatively small, usually than0.75° and typically less than 0.4°.

G. Sealing of Cartridge 5 within Housing 2

Referring to FIG. 5, cartridge 5 is shown positioned within interior 2 iwith end cap 180 inserted toward end cover 20. Outer peripheral sealregion 200 of end cap 180 is shown forming a radial seal against:interior surface 80 x of flange 80, FIG. 11; and, region 210 of housingcentral cartridge receiving section 10, FIG. 11; region 210 beingadjacent end 12.

As a result, outer peripheral region 200, i.e. seal surface 201, of endcap 180 forms a water (weather) seal over joint 74 between end piece 20and center section 10. Further seal surface 201 provides a seal betweencartridge 5 and housing 2, at least at surfaces 80 x, 210, inhibitingair flow from reaching outlet 22 without passage through media 5.

Referring to FIG. 11, it is noted that region 210 of housing section 10includes a radially inwardly projecting bead 215 thereat. This bead isoverlapped by a portion of seal 200 in particular shoulder or projection206, especiallu region 206 p, FIG. 9G to facilitate the seal. Thus,housing seal arrangement 200 forms both: a water seal over joint 74between end piece 20 and housing section 10; and, a housing radial sealbetween cartridge 5 and housing 2, in particular end piece 20,inhibiting air flow from reaching outlet tube 21 without passage throughmedia 170 p, of cartridge 5.

Referring to FIG. 14, inner surface 40 x of region 40 includes aplurality of spaced, arcuate, projections 220. Referring to FIG. 11, theprojections 220 are configured to project into end cap 180 at a selectedregion, in particular along groove 207. Projections 220 can provide forstrength and rigidity in section 40. In addition, engagement between theprojections 220 and groove 207 can facilitate installation of a propercartridge 5 within housing 2.

H. Engagement of Cartridge 5 within Housing 2 with: Cartridge Support 7;and, Access Cover 15.

Referring to FIG. 5, at end 172, of media 170 p, i.e. at an end ofcartridge 5 adjacent end cap 181, cartridge 5 is engaged by access cover15 and support 7.

Referring to FIG. 18, attention is directed to the end member 122 onsupport 7. End member 122 is, again, opposite end 120. End 122 projectsin a direction away from end 12 of housing central section 7 toward end11, FIG. 1, when support 7 is installed.

For the example depicted, FIG. 18, end member 122 includes twoprojection sections: first (perimeter ring) projection 300; and, second(central) projection member 301. Each of projection sections 300 and 301project axially away from shoulder 121 s in a direction away fromsupport end 120. By “axially” in this context, it is meant that theprojections 300, 301 are in the same general direction as longitudinalaxis 26, FIG. 20, a cross-sectional view.

Referring to the enlarged, fragmentary cross-sectional view of FIG. 21,for the example shown, first (ring) projection 300 is separated fromsecond (center) projection 301 by outer surface recess region 302 whichextends around projection 301. Also, in the example shown, ringprojection 300 is continuous and circumscribes (surrounds) centerprojection 301, spaced therefrom by recess 302.

Still referring to FIG. 21, end member 122 includes an outer surface 122x and an inner surface 122 y. Recess 302, again, is in outer surface 122x.

Herein, when it is said that the projection is “axial” or extends“axially”, it is not meant that the projection is necessarily perfectlyco-linear with central longitudinal axis 26, but rather it is in thesame general longitudinal direction.

In the particular example depicted, central projection 301 is conical inshape and would have a circular cross section in a plane perpendicularto axis 26. More specifically, projection 301 has a conical side wall301 s, FIG. 18, which tapers inwardly from recess 302 to tip 301 t. Tip301 t, however, is somewhat truncated, and does not necessarily come toeither a sharp point or a completely flat end.

In more general terms, cartridge support end 122, of support 7, hasouter surface 122 x and inner surface 122 y. The example cartridgesupport end 122 is contoured on both surfaces 122 x, 122 y. The exampleshape (depicted) is such that there is a central (in the example shownconical) projection 301 spaced from a ring projection 300 by a recess302, in the outer surface 122 x. The inner surface 122 y is defined witha central (for the example shown conical) outer projection recess 301 ispaced from recessed ring 300 i by surface 302 i, leaving theobservation that surface 302 i generally projects toward end wall 20 andrecesses 300 i, 301 i project away from end wall 20, FIG. 5.

Projection 300 includes an outer perimeter surface 300 p, FIG. 21. Forthe example shown, perimeter surface 300 p is a smooth, non-contouredsurface defining a circular perimeter, and thus has a generallycylindrical shape. The cylinder surface 300 p may taper outwardlyslightly in extension away from end 300 t toward shoulder 121 s in someapplications. End member 122 includes a peripheral shoulder 121 sprojecting radially outwardly from a base end of surface 300 p. Surface300 p is defined to project through aperture 160 of end cap 155 (of asafety or secondary cartridge 6), FIGS. 24-26, when used. Shoulder 310is sized and positioned to receive end cap 155 abutting thereagainst,when the safety cartridge 6 is installed.

It is noted that is end cap 155, or a portion thereof, is made of anappropriate material, at selected locations where end cap 155 abuts end122, under pressure from cartridge 5, a seal between safety cartridge 6and support 7 can be formed. For example axial pressure from cartridge 5against end cap 155, FIG. 5, can cause a seal to be formed between endcap 155 and shoulder 121 s. In addition, or alternately, a radial sealor a similar seal can be formed between aperture 160 and surface 300 p,if desired.

Attention is now directed to FIG. 22. In FIG. 22 an end view of support7 is provided; FIG. 22 being taken toward end member 122. In FIG. 22,central projection 301 is viewable, surrounded by recess surface 302.Outer projection 300 is also viewable, including outer circular wall 300p and an opposite inner wall 300 x.

Central projection 301, recessed surface 302 and ring projection 300collectively define receiver recess 320, FIG. 21, in outer surface 122 xof end 122. Receiver recess 320 is positioned to receive, projectingtherein, a corresponding projection member on a primary filter cartridge5 during installation, as discussed below.

In general terms, outer surface 122 x, of end member 122, defines afirst member of a projection/receiver arrangement providing forengagement between the cartridge 5 and the central cartridge support 7.As will be understood from following descriptions, projections 300, 301,project into receiver sections of a corresponding primary filtercartridge 5; and, a portion of a primary filter cartridge 5 projectsinto receiver 320 on support 122.

For the example assembly depicted, the inner wall 300 x of ringprojection 300, FIG. 21, can be seen in FIG. 22 to have a serpentinesurface shape with alternating outwardly curved, concave, sections 324and inwardly projecting convex portions 325.

Herein the term “serpentine” when used to refer to the definition of asurface or wall, it is meant to refer to a surface that does not definea circular definition, but rather includes alternating convex andconcave sections therein.

For the particular, example, serpentine wall surface 300 x, has eight(8) concave sections 324 separated by eight (8) convex portions 325, inextension of wall 300 x around center projection 301. For the exampledepicted, each concave section 324 is the same shape and size as theother concave sections; and, each convex portion 325 is the same shapeand size as the other convex portions. Thus, an eight (8) petalarrangement is defined by wall 300 x. For the particular example,serpentine wall surface 300 x depicted, the petal arrangement has 8-foldrotational symmetry, i.e., each petal is the same size and shape as eachother petal, and the petals are evenly, radially, spaced. In thiscontext, the term “8-fold rotational symmetry” is used to refer to ashape definition which can be rotated around a central axis 26 (orcenter) with eight, evenly radially spaced positions, in which it canalign with itself. Thus, an octagon has 8-fold rotational symmetry,whereas (in contrast) a square has 4-fold rotational symmetry.

In more general terms, serpentine surface 300 x comprises alternatingconvex and concave sections, usually at least three (3) concavesections, typically at least five (5) concave sections and usually 6-10concave sections.

In FIG. 21, example dimensions are provided as follows: LA=25.8 mm; and,LB=16.7 mm.

In FIG. 22, example dimensions are provided as follows: NA=45°; NB=6 mm;and, NC=3 mm.

Attention is now directed to FIG. 7, an enlarged, fragmentary view,depicting in part, a cross sectional view of end cap 181 of cartridge 5.Also in FIG. 7, portion of support 7, safety cartridge 6, and accesscover 15 are depicted, in exploded view.

Referring to FIG. 7, end cap 181 includes central recess portion 332comprising a central closure portion of end cap 181 having the followingfeatures: outer peripheral wall 335 directed toward end cap 180; andcontoured end wall 336. The outer wall 335, FIG. 7A, generally projectsinto interior 185 of the media pack 170. Adjacent or slightly spacedfrom media pack interior 185, FIG. 7, inner wall or closure portion 336generally extends across the interior 185; to close interior 185 at endcap 181.

End wall or closure portion 336, FIG. 7A includes inner surface 336 yand outer surface 336 x. The inner surface 336 y is generally directedtoward end cap 180 of cartridge 5, FIG. 9. Surface 336 x is generallyopposite surface 336 y, and is directed away from end cap 180, FIG. 9.

End portion 336 y, FIG. 7A, is contoured and includes peripheral outerring portion 340, positioned radially inwardly, and surrounded by outerperipheral wall 335. Radially inwardly from peripheral ring portion 340is provided inwardly projecting ring 341 defined by outer wall section342, inner wall section 343 and end wall section 344. By “inwardly” inthis context, it is meant that ring 341 generally projects into themedia pack 185, in a direction toward end cap 180, FIG. 9. Theprojecting ring 341 is surrounded by peripheral ring portion 340.

In the example shown, FIG. 7A, section 336 includes, on end surface 336y, in peripheral ring 340, a recess 345 between outer wall 345 i andwall 342. Recess 345 is generally directed away from end cap 180 and issized to receive projecting therein a portion of projection 300 onsupport 7, during installation. Recess 345 is typically continuous inextension around a central axis 26.

Wall section 342 typically has a serpentine shape of alternatingoutwardly directed convex and outwardly directed concave (or inwardlydirected convex) sections, which engage wall 300 x. That is, serpentinesurface 300 x, FIG. 7, pushes around and engages serpentine surface 342,in surface-to-surface (or near surface-to-surface) engagement. As aresult of the petal structure on surface 300 x receiving outwardlyprojected petals on serpentine wall 342. When this engagement occurs,end cap 181, and thus cartridge 5, will not readily rotate relative tocentral cartridge support 7 when installed.

Alternately stated, once cartridge 5 is installed over support 7,rotational motion of cartridge 5 around support 7 is inhibited, as aresult of a rotational interference interaction between the petal shapeof serpentine wall 300 s, and the petal shape of serpentine surface of342. Together, these surfaces form an anti-rotational engagement betweencartridge 5 and central cartridge support 7. This helps insure that thecartridge 5 can only be installed in one of selected rotationalorientations relative to support 7. When eight (8) petals are present ineach of walls 300 s, 342, with 8-fold symmetry, eight rotationalpositions are possible.

In general terms, axially inwardly projecting projection 344, defined byouter 342 and inner wall 343, is a projection member of aprojection/receiver arrangement, which projects into receiver 320, FIG.21, of support 7 when installed. A radial interlock arrangement, due toa serpentine shape of wall 342 and 301 s is provided.

Spaced radially inwardly of wall 342, FIG. 7A, surface 336 y includes acentral outer projection or recess 345 r, defining projection 345 x. Thecentral recess 345 r includes an outer end section 386 and side wall347. For the example depicted, the side wall 347 is generally conicaland surrounds central axis 26.

Referring to FIG. 7, central outer projection 345 x (or recess 345 r) issized to receive projecting therein, central projection 301 on end 122of central cartridge support 7, when the cartridge 5 is installed overthe portion 7. Thus, recess 345 r and projection 301 define anotherprojection/receiver arrangement.

Central projection 345 x is surrounded by projecting ring 344.

Attention is now directed to outer surface 336 x, FIG. 7A. Outer surface336 x includes, defined therein, receiver groove 360, between walls 342,343. Groove 360 is a receiver groove for a projection on access cover15, as discussed below. In general terms, groove 360 is a member ofanother projection/receiver arrangement, in this instance providingengagement between the access cover 15 and cartridge 5.

The groove 366 is typically at least 6 mm deep, and its outer wall 342is typically spaced at least 15 mm from the media 170.

Referring to FIG. 7A, side surface 360 s, of groove 360, which is one ofthe surfaces of wall 342, is serpentine, with an alternating convex, andconcave sections.

Attention is directed now to FIG. 9A, a schematic, outer, plan view ofcartridge 7, in particular directed towards surface 336 x. Centralgroove 360 is viewable.

In FIG. 9B an inside end view of cartridge 6 is depicted, i.e., towardsurface 336 y. Recess 345 r is viewable.

In FIG. 9D, an enlarged fragmentary view of a portion of surface 336 xis viewable. Groove 360, with inner wall 336 and outer, serpentine, wall360 s is viewable.

In FIG. 9E, an enlarged fragmentary view of a portion of FIG. 9B isviewable. Recess 345 r is viewable.

Attention is directed again to FIG. 7. Access cover 15 includes aperipheral rim 370 and outer end surface 15 x with central section 371.

In FIG. 7, access cover 15 is shown in cross-sectional view. Accesscover 15 includes interior surface 15 y, which faces in interior ofhousing 2. Peripheral rim 370, is sized and positioned to engagesidewall 10 s, during installation, FIG. 5. In some instances, whenaccess cover is installed, an o-ring or similar gasket will bepositioned between the access cover 15, and housing sidewall 10 s. Anexample o-ring is depicted in FIG. 10 at 371. Alternate locations forthe o-ring 371, however, are possible. In general, the gasket or o-ring371 provides water (weather) seal between access cover 15 and sidewall10 s.

Referring again to FIG. 7, inner surface 15 y comprises a surface whichengages cartridge 5, during installation. Inner surface 15 y includesouter ring section 380, which overlaps an end of the media pack 170during installation. Further, radially outwardly from region 380 isinwardly projecting flange or shield 382. Flange or shield 382 generallysurrounds an end of media pack 170, and end cap 181, duringinstallation.

Radially inwardly from wall 382, and on surface 15 y, is providedprojection 384. Projection 384 is sized and shaped to surround receiver385 r, and to project within receiving groove 360, during installation.The projection 384 is typically continuous in extension around axis 26,although alternatives are possible. Further, projection 384 is typicallysolid (non-hollow) and typically includes no apertures therethrough.

The projection 384 has a radial outer surface 385 and a radial inwardsurface 386. For the example shown, the outer surface 385 is generallyserpentine, comprising alternating outwardly convex and inwardly concavesections; and, inner wall 386 is generally serpentine havingcorresponding inwardly projecting convex and outwardly projectingconcave regions, which alternate with respect to one another. Outwardlyprojecting convex sections of surface 385 are aligned radially withoutwardly projecting concave sections of surface 386; and, inwardlyprojecting concave sections of surface 385 are radially aligned withinwardly projecting convex sections of surface 386.

The projection 384 is sized and shaped to be received within receivinggroove 360, FIG. 7; as a projection/receiver arrangement. For theparticular assembly depicted, wall 385, when it has a serpentinecharacteristic, is configured to engage serpentine wall 360 s androtationally interlock therewith. Thus, cartridge 5 is supported againstrotation by access cover 15, as well as support 7.

It is noted that access cover 15 is also viewable in an enlarged,cross-sectional view in FIG. 7B.

Typically the dimension across projection 384, between opposite portionsof inner surface 386 is at least 10 mm, usually at least 15 mm often atleast 18 mm, for example 18-40 mm inclusive.

Still referring to FIG. 7, projection 384 surrounds central outerprojection 390. Central outer projection 390, in surface 15 y, generallyand defines a receiving space 385 r for projection 345 x.

Still referring to FIG. 7B, surrounding region 380, and spaced inwardlyfrom outer wall 370, again, is provided shield 382, a circular flangewhich surrounds and is normally spaced from cartridge 5. Between wall370 and shield 382 is provided a space 396 for dust and air flow aroundshield 382 in overlap with entry 30 e to dust drop tube 30, FIG. 5. Thiswill facilitate dust and water separation.

From a review of the figures above, advantageous interaction amongcentral cartridge support 7; main filter cartridge 5; and, the accesscover 15 can be understood. In general: when the cartridge 5 ispositioned over support 7, typically with safety cartridge 6therebetween, cartridge 5 will be positioned with projection 344received in receiver 320; and, with projection 301 projecting intoreceiver 345 r. Serpentine engagement for wall 342 and wall 300 s, willinhibit rotation of cartridge 5 relative to support 7. Thus, cartridge 5is supported at end 181, by support 7. When end cap 155 on safetycartridge 6 is positioned therebetween, surface 340 pushes against endcap 155, and end cap 155 will be push against shoulder 121 s, formingseals therebetween.

When access cover 15 is positioned in place, projection 384 will extendinto receiver 360; and, the central conical projection of cartridge 5,forming recess 345 r, will project into recess 385 r. Outer serpentinesurface 385 of projection 384 will rotationally lock with serpentinesurface 360 s receiver 360, again inhibiting rotational movement.

The total interlock arrangement resulting from access cover 15, inparticular central portion 384 with its contoured outer surface,cartridge 5 and support 7, will: ensure that access cover 15 is notpositioned on housing central section 10 with a cartridge 5 thereinunless cartridge 5 is properly positioned; help support cartridge 5, atend cap 181, against cantilevered motion, and/or undesirable rotationalmotion; and, will help ensure that the cartridge 5 installed withinhousing 2, for use, is a proper and appropriate cartridge for thesystem.

I. Methods of Assembly

Attention is now directed to FIG. 6. In FIG. 6, assembly involvingselected components identified above is schematically indicated. Inparticular, cartridge 5 is shown positioned over secondary or safetycartridge 6, which is shown over support 7. Further, access cover 15 isshown aligned to interact with end cap 181 of cartridge 5.

In FIG. 7, as previously discussed, a fragmentary view of a portion ofFIG. 6 is depicted.

In FIG. 27, an enlarged fragmentary view of selected portions of housing2 is depicted. Here section 10 is shown with support 7 received therein,the support 7 having end 120 configured to engage end wall 20, inparticular ring 76.

In FIG. 28, a cross-sectional view of FIG. 27 is viewable. Here,assembly steps involving pushing end cover 20 into engagement withhousing section 10 and support 7 are schematically depicted.

In general, steps of assembly of the housing 2, which can be conductedin alternate order of those recited are as follows: end piece 20 is snapfit into housing section 10; and support 7 is snap fit into end piece20.

In general terms, installation of the cartridge 5, and safety cartridge6, and securing in place, occurs as follows: safety cartridge 6 ispushed over support 7; main cartridge 5 is pushed over safety orsecondary cartridge 6, with seal arrangement 200 sealing to the housing2, including over joint 74 between housing section 2 and end piece 20.Installation involves pushing end cap 181 over cap 155 of safetycartridge 7, causing a seal therebetween; and, pushing projections 300,301, into recesses 345, 345 r, in end cap 181. Finally, access cover 15is latched in place. Access cover 15 is rotationally indexed to adesired orientation, before latching. Further projection 384 is extendedinto groove 360.

Typically, support of the cartridge 5, by access cover 15, is notprovided around cartridge 5, to advantage. In particular, if ring 382,FIG. 7B were sized to engage an outer portion of end cap 181, especiallyunder conditions of temperature fluctuations, cartridge 5 could becomestuck to or jammed against wall 382. Should this occur, as access cover15 is removed, cartridge 5 may also be undesirably dislodged from itssealed location, an undesirable circumstance.

J. Seal Materials

As described previously, end cap 180, and in particular seal arrangement200, can be molded-in-place from a material suitable for forming a sealarrangement. Typically, foamed polyurethane having as molded density ofno greater than 28 lbs/cu.ft. (450 kg/cu.m) typically no greater than 22lbs. cu.ft. (355 kg/cu.m); and, usually within in the range of 12 to 17lbs/cu. ft (192-225 kg/cu. m) inclusive is usable. Also, typically thematerial will exhibit a hardness, shore A of no greater than 25,typically no greater than 20 an often within the range of 10 to 20,inclusive.

It is further noted that the end cap 159 for the safety element ascharacterized above, can be made from similar materials, in someinstances. However alternatives are possible. In addition, a similarpolyurethane can be used to form a molded-in-place portion 400 of endcap 181; molded-in-place portion 400 securing and potting support 175 inplace, on media 170. Referring to FIG. 7A, molded-in-place portion 400,when formed from such a compressible polyurethane, can be provided withcompressible, axially outwardly directed, ribs or ridges 401 which canpress against a portion of access cover 15, to provide vibrationdampening.

K. Reference to Other Patent Filings and Publications

Selected features described herein are variations of featurescharacterized in previous patent filings of Donaldson Company, Inc, theassignee of the present disclosure. For example, a conical filterelement with a end having an outwardly directed radial seal thereon,including a groove in the end cap is described in PCT WO 2006/119414,published Nov. 9, 2006, incorporated herein by reference. In U.S.provisional application 60/921,536 filed Apr. 3, 2007, incorporatedherein by reference, projects on a housing engaging a groove on an endcap are provided. In U.S. 60/961,522, filed Jul. 20, 2007, incorporatedherein by reference, interlock features between a housing access coverand a filter cartridge are described. These features also are includedin an improvement provisional application, U.S. 61/072,162 filed Mar.27, 2008, incorporated herein by reference.

A system including an interior cartridge support, a filter cartridge,housing access cover interaction, is described in U.S. Provisionalapplication 60/961,521, filed Jul. 20, 2007, the complete of disclosureof which is incorporated herein by reference.

II. Some Alternate Embodiments

Herein, some alternate embodiments are described. These alternateembodiments are depicted in FIGS. 29-31.

Referring first to FIG. 29, a fragmentary, schematic, cross-sectionalview of an alternate embodiment 500 is depicted. The alternateembodiment 500 includes the access cover 15 analogous to the previouslydescribed access cover; and, includes a support 7 and safety cartridge6, analogous to those previously described. The main filter cartridge 5is analogous to previously main described filter cartridge, with respectto media 170 and outer support 175. End cap 181, however, is different.In particular, end cap 181 includes a central inner portion 501 defininga peripheral wall 501 p directed toward the first end cap, and aradially inwardly projecting ring 506 defining a central aperture 502 a.The member 501, then, includes outer peripheral wall 501 p and base ring506 surrounding aperture 502. The base ring 506 includes a inner axialsurface 508, configured to engage end cap 155 of cartridge 6 to providea seal at the location of interaction. Thus, in general terms, for theexample arrangement 500 depicted in FIG. 29, end cap 181 is not a closedend cap, but rather includes a central aperture 502 a therethrough. Theaperture 502 a would typically have an internal cross-section size of atleast, 45%, often 50 to 70%, inclusive, of a dimension across aninterior of media 170, adjacent the aperture 502.

As a result of end cap 181 being open, a seal is needed to preventleakage of air therethrough. A seal is provided at 510, by engagement ofportion of end cap 181 with seal 159, in particular radial innerprojection 506 on axial inner wall 501 p.

In FIG. 30, a perspective view of the assembly of FIG. 29 is depicted.

For FIG. 31, a further alternate arrangement is depicted at 550. Here,the same access cover 15, the same support 7 and the same safety element6 are used. The main cartridge 5 still includes media 170 surrounded bysupport 175, with end cap 181. End cap 181 is still open, analogously tothe arrangement of FIGS. 30 and 31, with end cap 181 including a centralpiece 501 having peripheral wall 501 p and radially inwardly directedwall 502, defining aperture 502 a. On the radially inwardly directedwall 502 is positioned a seal member 520 positioned to be engagedbetween portion of access cover 15 and projection 300 on support 7.Here, aperture 502 a may be somewhat smaller than the aperture 502 a,FIGS. 29 and 30, for example 25-50%, typically 30-50%, of a distanceacross the cartridge interior adjacent aperture 502 e.

In the embodiments of FIGS. 29-31, a projection on the access cover 15,and projection(s) on the support 7, project through an aperture 502 a inthe end cap 181.

Further alternate embodiments are possible. For example, if a safetycartridge is not desired, a seal ring configured analogously to ring155, but without media thereon, can be positioned between portions ofthe cartridge 5 and support 7 in various one of the describedembodiments.

III. Some General Observations

According to certain aspects of the present disclosure, an air filtercartridge is provided, usable as a serviceable air filter cartridge inan air cleaner assembly, as the main filter cartridge. The air filtercartridge includes a media pack comprising media surrounding an openinterior. The media can be pleated, although alternatives are possible.The media has first and second ends. In some applications, the media isprovided in a conical form, in extension between the first and secondends.

The air filter cartridge includes a first end cap positioned on themedia pack first end. The first end cap has a central aperturetherethrough. When the media is conical, the first end cap is typicallypositioned at the larger end of the conical configuration.

A seal member is positioned on the first end cap. This seal member, inexamples depicted, is configured to form an outwardly directed radialseal around an outer periphery of the first end cap. This outerperipheral seal is typically also positioned around an outer portion ofthe first end of the media pack. In a typical arrangement, the sealmember is molded integral with a remainder of the first end cap. Anexample material usable for this is a foamed polyurethane, as described.

A second end cap is positioned in the air filter cartridge on the mediapack second end. In an example embodiment described herein, the secondend cap is a closed end cap. In examples in which the second end cap isclosed, the second end cap includes a central closure portion extendingacross the open interior of the media pack adjacent the media packsecond end. The central closure portion, in an example embodiment,includes opposite inner and outer surfaces, the inner surface beingcontoured with: an outer peripheral sidewall portion, projecting towardthe first end cap; a peripheral ring portion positioned radiallyinwardly from the peripheral sidewall portion; a projecting ringextending inwardly of the media pack interior, toward the first end cap,from the peripheral ring portion; and, a central recess projecting in adirection away from the first end cap.

In an example embodiment, the central recess is surrounded by theprojecting ring; the projecting ring is surrounded by the peripheralring portion; and, the peripheral ring portion is surrounded by theouter peripheral sidewall portion.

In an example arrangement described herein, the peripheral ring portionincludes a ring recess therein, projecting away from the first end cap.

The contoured surface portion of the central closure portion isconfigured to be positioned between: various projections or recesses ona filter support, within a housing during use; and a portion of anaccess cover, positioned on an air cleaner assembly in use.

In an example arrangement described, the outer surface of the centralclosure portion includes a central, outwardly, projecting, conicalportion surrounding, and defining, an outer surface of the centralrecess in the inner surface. Further, in an example arrangement, theouter surface of the central closure portion includes a serpentinesurface surrounding, and spaced from, the central outwardly projectingconical portion, to define a receiving groove therebetween having anouter, serpentine surface.

According to an aspect of the present disclosure, the filter cartridgeis provided with an inner surface of the central closure portionincluding a serpentine wall defining a radially outer surface of theprojecting ring that extends toward the first end cap from theperipheral ring portion.

In an example arrangement, the air filter cartridge includes an outerliner surrounding the media pack; and in an example described, the outerliner comprises a portion of pre-form and is integral (molded integrallywith) with the central closure portion of the second end cap.

In a particular seal arrangement described, a peripheral seal surfaceincludes: a tapered tip portion; and, a sidewall portion extending in atleast 5 mm from the tip portion toward the second end cap. Typically thesidewall portion has a length within the range of 5 to 15 mm and isflat, i.e. does not include steps or ribs therein. In an examplearrangement depicted, the seal member includes a radially, outwardlyprojecting shoulder arrangement thereon, on an opposite end of thesidewall portion from the tip portion.

Also in accord with the general descriptions herein, an air filtercartridge is provided that includes a media pack, comprising mediasurrounding an open filter interior; the media having first and secondends. A first end cap is positioned on the media pack first end, with acentral aperture therethrough. A seal member is positioned on the firstend cap, to form an outwardly directed radial seal on an outer peripheryof the first end cap, that outer periphery also being positioned aroundend of the media. A second end cap is positioned on the media secondend, and is typically closed. The second end cap includes a centralclosure portion extending across the open interior of the media packadjacent the media pack second end. The central closure portion hasopposite inner and outer surfaces, with the outer surface having areceiving groove at least 6 mm deep therein, and having an outer wallspaced radially, inwardly a distance of at least 15 mm from the media.Further, the inner surface of the closure portion is configured with acentral receiver projection therein, extending away from the first endcap; the central receiver being surrounded by the receiving groove. Thisembodiment can include additional features characterized above.

In an example arrangement, the central closure portion inner surfaceincludes a serpentine wall surrounding the receiving groove of the outersurface, the receiving groove also having a serpentine outer wall. Thisreceiving groove serpentine outer wall can comprise an opposite side ofthe central closure portion, from the inner surface defining aserpentine wall.

According to another aspect of the present disclosure, an air filtercartridge is provided comprising a media pack, and first end cap with aseal thereon, the seal member including a tapered tip portion, asidewall portion at least 5 mm long extending toward the second end capfrom adjacent the tapered tip portion, and a radially, outwardlyprojecting shoulder arrangement at an opposite end of the sidewallportion from the tip portion. A second end cap is positioned on themedia pack second end.

This characterized filter cartridge can include additional features,characterized generally above.

Also according to the present disclosure, an air cleaner assembly isprovided. The air cleaner assembly includes a housing defining aninterior and having an air flow inlet and air flow outlet. The housingdefines a service access end with a removable access cover positionedthereover. The access cover includes a central (serpentine) projectionthereon, surrounding a receiver interior, and extending into the housinginterior from the access cover. A central cartridge support ispositioned projecting toward the access cover from an end of the housingopposite the access cover. The central cartridge support has a firstend, remote from the end of the housing opposite the access cover. Thefirst end has a receiving groove surrounding a central projection; thecentral projection extending toward the access cover.

A main filter cartridge is removably positioned in the housing interior.The main filter cartridge comprises a media pack including mediasurrounding an open interior, the media pack (and media) having firstand second ends. The cartridge includes a first end cap positioned onthe media pack first end, the first end cap having a central aperturetherethrough. A seal member is positioned on the first end cap orientedaround the outer perimeter of the first end cap of the media pack, andremovably sealed to the housing. By the term “removably sealed” in thiscontext, it is meant that the cartridge can be separated from thehousing, breaking the seal, as the cartridge is removed from thehousing, without damage to either the housing or the filter cartridge.The filter cartridge includes an end cap positioned on the media secondend. The end cap, in an example described, is a closed end cap thatincludes a portion projecting into the receiving groove on the end ofthe central cartridge support; and, a portion extending over the centralprojection of the central cartridge support. Further, the second end capincludes an outer surface with a receiving groove therein, which hasprojecting therein the central serpentine projection on the accesscover.

A variety of specific features usable in the filter cartridge, arepreviously described.

In an example assembly, the housing includes a sidewall with an end wall(or end piece) snap fit to the sidewall. A snap fit connection around anouter periphery of the end wall is described. The snap fit projectioncan include a rotational indexing arrangement thereon. In an example aircleaner described, filter cartridge is positioned with a seal membersealing over a joint between the sidewall and end wall of the housing,to provide a weather or water seal.

In an example arrangement described, the central cartridge support issnap fit to the housing.

Also in a example arrangement described, a secondary filter cartridge isdescribed, positioned over the central support between the centralsupport and the main filter cartridge. An example secondary filtercartridge is described that includes an end cap having a centralaperture therethrough, the end cap of the secondary filter cartridgebeing positioned on the first end of the cartridge support, with thecentral projection on the cartridge support projecting through theaperture on the end cap of the secondary filter and with a second endcap of the main filter cartridge abutting the end cap of the secondaryfilter cartridge.

An example secondary filter cartridge is provided having a conical shapewith only one end cap thereon, the end cap being positioned on thesmaller end of the conical shape. The secondary filter cartridgedescribed includes a sidewall with an outer peripheral porousconfiguration surrounding an interiorly positioned filter media. An endof the media pack remote from the end cap includes no end cap thereon,and is designed to snuggly fit around a base portion of the cartridgesupport, adjacent a location when cartridge support engages the housingend wall.

In an example described, the access cover includes a dust drop tubethereon, and in a particular embodiment, the access cover includes ashield surrounding, and spaced from, a second end of the main filtercartridge when installed, the dust drop tube being positioned to engagethe access cover at a location spaced from the filter cartridge by theshield.

According to an alternate aspect of the present disclosure, an airfilter cartridge is provided which includes a media pack comprisingmedia surrounding an open interior having first and second ends. Themedia pack and media typically has a conical shape tapering downwardlyfrom the first end to second end.

A first end cap is positioned on the media first end, the first end caphaving a central aperture therethrough.

A seal member is positioned on the first end cap, the seal member beingpositioned to form an outwardly radial seal around an outer periphery ofthe first end cap. The seal member can be formed integral with the firstend cap.

The second end cap is positioned on the media second end. The second endcap includes an inner portion with a peripheral wall projecting towardthe first end cap. The upper portion also includes a ring sectionprojecting radially inwardly from the peripheral wall, and surroundingand defining a central aperture therethrough.

A second end cap is generally sized and configured to form a seal witheither the end cap of a safety cartridge positioned inside of the maincartridge, in use, or a portion of a cartridge support within in an aircleaner housing, in use. In an example arrangement to effect to latter,the ring section includes a seal member thereon.

Also in accord with the present disclosure, an air cleaner assembly isprovided which includes a main filter cartridge having an end cap of thetype described in the previous two paragraphs. Typically, the mainfilter cartridge is positioned with the inner portion of the second endcap sealed either to the support or to a safety cartridge. In generalterms, however, the housing is configured with an access cover includinga central projection that extends through the aperture of the mainfilter cartridge, and the housing includes a central support with aportion projecting through the aperture of the main cartridge second endcap.

Various features and techniques for accomplishing this, includingsealing the second end cap of the main filter are described.

Methods of assembly and use are also described.

It is again noted that there is no requirement that an assembly includeall of the features and characteristics herein, to obtain some benefitaccording to the present disclosure.

What is claimed:
 1. An air filter cartridge comprising: (a) a media packincluding media surrounding an open filter interior and having first andsecond ends; (i) the media pack having a conical shape with a larger endadjacent the first end and a smaller end adjacent the second end; (b) afirst end cap positioned on the media first end; (i) the first end caphaving a central aperture therein; (c) a radially directed seal memberpositioned on the first end cap; and, (d) a second end cap positioned onthe media second end; the second end cap including an inner surface andan outer surface; (i) the outer surface including a first receivinggroove therein; (A) the first receiving groove having inner and outerwalls; (B) the outer wall of the receiving groove being spaced radiallyinwardly at least 15 mm from the media; and, (ii) the inner surfacehaving a central receiver projecting outwardly away from the first endcap; (A) the central receiver being formed by an inner surface of acentral projection; the central projection being on the outer surface ofthe second end cap and projecting away from the first end cap; (iii) thecentral receiver being surrounded by the receiving groove; and, (iv) thecentral projection extending further in a direction away from the firstend piece than the outer wall of the receiving groove.
 2. An air filtercartridge according to claim 1 wherein: (a) the first receiving grooveis at least 6 mm deep at a location between the inner and outer walls.3. An air filter cartridge according to claim 2 wherein: (a) the sealmember on the first end cap is molded integral with a remainder of thefirst end cap.
 4. An air filter cartridge according to claim 3 wherein:(a) the first end cap has a first seal portion oriented to form a first,radially directed, releasable radial seal with a housing; and, (b) thefirst end cap has a second radial seal portion oriented to form a secondradially directed seal with a housing; (i) the first and second sealportions being configured to form seals that differs from one another,in longest cross-dimension, by at least 2 mm.
 5. An air filter cartridgeaccording to claim 3 wherein: (a) the first end cap includes an endsurface facing a direction away from the second end cap; (i) the endsurface of the first end cap including a groove therein.
 6. An airfilter cartridge according to claim 5 wherein: (a) the groove in the endsurface of the first end cap is a continuous groove in extension aroundthe central aperture.
 7. An air filter cartridge according to claim 6wherein: (a) the groove in the end of the first end cap is positioned inaxial overlap with the media pack.
 8. An air filter cartridge accordingto claim 1 wherein: (a) the first end cap includes an end surface facinga direction away from the second end cap; (i) the end surface of thefirst end cap including a groove therein.
 9. An air filter cartridgeaccording to claim 8 wherein: (a) the groove in the end surface of thefirst end cap is a continuous groove in extension around the centralaperture.
 10. An air filter cartridge according to claim 9 wherein: (a)the groove in the end of the first end cap is positioned in axialoverlap with the media pack.
 11. An air filter cartridge according toclaim 3 wherein: (a) the inner wall of the first receiving groove has aserpentine shape.
 12. An air filter cartridge according to claim 11wherein: (a) the inner wall of the first receiving groove has aserpentine shape with 6-10 concave sections.
 13. An air filter cartridgeaccording to claim 12 wherein: (a) the outer wall of the first receivinggroove has a serpentine shape.
 14. An air filter cartridge according toclaim 13 wherein: (a) the outer wall of the first receiving groove has aserpentine shape with 6-10 concave sections.
 15. An air filter cartridgeaccording to claim 3 wherein: (a) the outer wall of the first receivinggroove has a serpentine shape.
 16. An air filter cartridge according toclaim 15 wherein: (a) the outer wall of the first receiving groove has aserpentine shape with 6-10 concave sections.
 17. An air filter cartridgeaccording to claim 1 wherein: (a) the outer wall of the first receivinggroove has a serpentine shape.
 18. An air filter cartridge according toclaim 17 wherein: (a) the outer wall of the first receiving groove has aserpentine shape with 6-10 concave sections.
 19. An air filter cartridgeaccording to claim 17 wherein: (a) the inner wall of the first receivinggroove has a serpentine shape.
 20. An air filter cartridge according toclaim 19 wherein: (a) the inner wall of the first receiving groove has aserpentine shape with 6-10 concave sections.